Here's the first pic.

They are really rampant:

Anybody know what these are and how best to control or prevent these?

Wish I could stop the rain, but of course not, so my citruses suffer:

Oh, My Joe:
I have the same thing.
Benny

Although I have told Benny on how we control this disease, not even knowing exactly what this is, we would like other's opinions and inputs on how best to handle this. We would like to learn as well, feel free to contribute, it will be appreciated, we don't know everything, us mere mortals,

Joe, I am going to guess "Greasy Spot". Greasy Spot is a bigger disease problem in Florida than California, however it does occur in California. In California the fungus that causes greasy spot is Mycosphaerella spp. The cause of the inoculumm is spores that are produced on decomposing fallen leaves. The inoculum is discharged within only a few minutes when the substrate is wetted by rain or irrigation. The path of the diease is unusual in that most of the infection occurs on mature leaves, rather then new growth. Control can be given by removal of leaf letter. Copper fungicides are highly effective, not only on greasy spot but on a wide range of fungus. Citrus spray oil is also widely used for greasy spot. Micronutrients such as zine, manganese and iron provide substantial control if applied at sufficiently high concentrations. Used in combination with oil, they may provide adequate contol and eliminate the need for fungicide application Alot of this information comes from the "Compendium of Citrus Diseases" If untreated leaf drop usually occurs, which inturn reduces fruit production and fruit size. By the way you are doing a superb job as our moderator. - Millet

Definitely not greasy spot, unless the symptoms are dramatically different in CA than in FL (and I doubt that; I've seen it all over the world and it is always exactly like ours).

I suspect oedema -- a disorder caused by sudden overabundance of water. Something we don't often see here, but I have seen it.

Malcolm

Thank you both Millet and Malcolm. For sure it was sudden overabundance of water but then seemed to be non-stop when it became overabundant. There's still more rains to come.

Dr. Manners would be correct. He certainly is extremely knowledgeable on citrus. Here is a web site with pictures of Oedema. Thanks Dr. Manners. http://www.rhs.org.uk/advice/profiles0101/oedema.asp
Oedema then must also be the disorder that causes thirsty fruit trees to develop all the dead necrotic spotting of their leaves the day after they are watered in the middle of a hot (90+) summer day. - Millet

I have a booklet from University of Florida called Citrus Problems in The Home Landscape, and your trees could have what's called Alternaria Brown Spot from all that rain.
"Later infection of leaves produces discrete brown spots and/or large blotches surrounded by yellow areas. A useful diagnostic symptom of Alternaria brown spot is the blackening of leaf veins leading from dark lesions. Early infection of fruit causes slightly sunken black to dark brown spots with yellow color halos and fruit drop.......Trees should be spaced widely to promote rapid drying of the tree canopy...Use copper fungicides to control this disease...From April through June, spray applications may be needed as often as 2 weeks depending on frequency of rainfall."

Definitely not Alternaria brown spot (nor any other Alternaria) either. It's oedema.

Hi Joe and all i here in Oregon have the same thing growing on my trees i just got .. There quarinteened but id like as much info as your willing to share Thanks tammy